Blowtorch



H. G. DONIGAN.

BLUWTORCH.

APPLICATION FILED IAR. 6, |920.

Patented Feb. 7, 1922.

UNITED lSTATES PATENT OFFICE.

BLOWTORCH.

Specication of Letters Patent.

Patented Feb. 7, 1922.

Application filed March 6,1920. Serial No. 363,870.

' construction hereinafter disclosed.

An object of the invention is to provide a blow torch for cutting metals, and other purposes, designed to effect a perfect mixture of the gases and producing a cutting flame of'a highdegree of heat, andl also designed to prevent back-nrein the gas pas-y sages.

Additional advantages of the construction will be apparent from., the detailed description of the invention taken iin connection with the accompanying drawing, in Which- Fig. 1 is an elevation showing the torch construction.

Fig. 2 is a vertical section through the head of the torch.

Fig. 3 is a cross section taken substantially on the line 3-3 of Fig. 2.

Fig. 4 is an end `view of the end of the torch nozzle.-

.The invention as illustrated in the drawing is. shown as comprising a Ahandle section 1 having gas passages 2 and 3 that connect preferably with flexible supply tubes 4 ,and 5 respectively. The passages 2 and 3 are controlled by valves 6 and 7 whereby the pressure and volume of the gas passing to the torch head are controlled. -There is a by-passl or high pressure conduit 8 thatis connected into the passage 2 beyond the supply side of the valve 6. This conduit 8 is controlled by a. separatebvalve 9 for controlling the pressure and volume of gas vpassing through the 'conduit 8. Forwardly extending conduits in the form of tubes 10 and 11 are connected respectivelywith the ends of the passages 2 and 3. A tubular cylindrical casing 12 is provided with hollow `bosses' 13 and 14, into which the tubes 10 and 11 are respectively connected, the boss 13 being near the top of the casing and the boss 14 being arranged below the boss 13. Passages 15 andl 16 extend 'respectively through the bosses 13 and' 11, and const1tute inlet passages for the inflow of the gases to the casing.

A nozzle 17 in the form of a hollow stem is adapted to be inserted in the casing 12 and held in position therein by threaded connection. The upper end .of the nozzle 17 terminates below the inlet passage 15 and the' nozzle is recessed at 18 so as to form a chamber at the end of the opening of the passage 16. The gas supply through the tube 10 enters the pas-sage 15 from whence 1t passes into the openingin the nozzle, and the gas from the 'tube 11 enters the recess 18 from whence it flows through ports 19 into the nozzle. The nozzle 17has a tapered flange 20 that .closes the end o the casing 12 when the nozzle is adjusted in position.

The lower end of the nozz1e'17 has an end wall 21 in which there is an annular series of openings 22 constituting jet openings for the gas mixture flowing through the nozzle.

A high pressure'nozzle in the form of a tube 23 having a screw plug head 24.- is arranged to be screwed into the upper end of the casing 12, the lower end of the tube 23 extending thro-ugh an opening 25 in the Wall 21. The head 24 has a ground flange 26 constituting a closure for the upper end of the casing 12, and a threaded section 27 of the head is adapted to be received in threads formed adjacent to thenpper end of the casing 12. The'inner face of the head 24 terminates above the opening of the passage 15 so that therewill'be a free flow of the gas through the passage into the nozzle opening with a slight space or chamber above the opening of the passage. The conduit 8 is connected into the head 24 of the high` pressure nozzle'so as to supply the gas to the nozzle.

In p-racticethe gases utilized are prefe-rably oxygen and acetylene which aresupplied respectively through the tubes 10' and 11, and a high pressure oxygen flow is supplied to' the nozzle 23 through the passage or conduit 8. The relative pressures of the gas as supplied to the nozzle are indepe-ndently controllable through the valves 6, 7 and 9. As the acetylene is injected into the nozzle passage, below the upper end thereof, there will always remain under all working conditions a column of oxygen ahead of the acetylene supply so as to prevent back-lire or ignition of the gas mixture in the supply passages.

The form of the mixing chamber also pro1 vides for a perfect mixture of the two gases for supplying the llame so that the torch may be operated for cutting metals economicallyv and eilciently.

I am aware that the invention may be modified in certain particulars without departing from the spirit and scope of the invention.

What I claim and desire to secure by Letters Patent, is

1. A blow torch, comprising a casing, a hollow stem extending into the casing from one end, means forming a connection between the inner end of said stem and said casing, a wall in the outer end of said stem having openings therethrough adjacent to the inner wall of the stem, a tube extendin into the casing from the opposite end an extending through said stem and through said wall in said stem, a pa-rt on said tube closing the end of the casing from which said tube is extended into the casin a chamber between Isaid stem and the wall of said casing, a gas inlet passage opening into said chamber, passages from said chamber throu h'the wall of the stem, passages through t e wall of said tube, a gas inlet passage opening linto said casing above the end of said stem, and a gas inlet passage opening into the end of said tube.

2. A blow torch, comprising a hollow casing, a hollow stem extending into one end of said casing and having its inner end forming a seal with the wall of said casing, a tube extending into the opposite end of said casing and into said stem throughout HORN G. DONIGAN; 

